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Mathematics 18 Online
OpenStudy (anonymous):

Suppose that 11% of all steel shafts produced by a certain process are nonconforming but can be reworked (rather than having to be scrapped). Consider a random sample of 200 shafts, and let X denote the number among these that are nonconforming and can be reworked. probability x is at most 30? less than 30? between 15 and 25?

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